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Centrality dependence of low-momentum direct-photon production in Au plus Au collisions at root s(NN)=200 GeV

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Al-Bataineh, H.; Al-Ta'ani, H.; Alexander, J. and Angerami, A., et al. (2015) In Physical Review C (Nuclear Physics) 91(6).
Abstract
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases... (More)
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N-part(alpha), where alpha = 1.38 +/- 0.03(stat) +/- 0.07(syst). (Less)
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Physical Review C (Nuclear Physics)
volume
91
issue
6
publisher
American Physical Society
external identifiers
  • wos:000355648500003
  • scopus:84935901818
ISSN
0556-2813
DOI
10.1103/PhysRevC.91.064904
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English
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yes
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2fba692b-a0c6-495a-a00c-b94502fa47ff (old id 7609201)
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2015-07-24 09:26:41
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@article{2fba692b-a0c6-495a-a00c-b94502fa47ff,
  abstract     = {The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N-part(alpha), where alpha = 1.38 +/- 0.03(stat) +/- 0.07(syst).},
  articleno    = {064904},
  author       = {Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. and Al-Ta'ani, H. and Alexander, J. and Angerami, A. and Aoki, K. and Apadula, N. and Aramaki, Y. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Baksay, G. and Baksay, L. and Bannier, B. and Barish, K. N. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Baublis, V. and Baumann, C. and Baumgart, S. and Bazilevsky, A. and Belikov, S. and Belmont, R. and Bennett, R. and Berdnikov, A. and Berdnikov, Y. and Bickley, A. A. and Bing, X. and Blau, D. S. and Bok, J. S. and Boyle, K. and Brooks, M. L. and Buesching, H. and Bumazhnov, V. and Bunce, G. and Butsyk, S. and Camacho, C. M. and Campbell, S. and Castera, P. and Chen, C. -H. and Chi, C. Y. and Chiu, M. and Choi, I. J. and Choi, J. B. and Choi, S. and Choudhury, R. K. and Christiansen, Peter and Chujo, T. and Chung, P. and Chvala, O. and Cianciolo, V. and Citron, Z. and Cole, B. A. and Connors, M. and Constantin, P. and Csanad, M. and Csoergo, T. and Dahms, T. and Dairaku, S. and Danchev, I. and Das, K. and Datta, A. and Daugherity, M. S. and David, G. and Denisov, A. and Deshpande, A. and Desmond, E. J. and Dharmawardane, K. V. and Dietzsch, O. and Ding, L. and Dion, A. and Donadelli, M. and Drapier, O. and Drees, A. and Drees, K. A. and Durham, J. M. and Durum, A. and Dutta, D. and D'Orazio, L. and Edwards, S. and Efremenko, Y. V. and Ellinghaus, F. and Engelmore, T. and Enokizono, A. and En'yo, H. and Esumi, S. and Eyser, K. O. and Fadem, B. and Fields, D. E. and Finger, M. and Finger Jr., M. and Fleuret, F. and Fokin, S. L. and Fraenkel, Z. and Frantz, J. E. and Franz, A. and Frawley, A. 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V. and Javani, M. and Jia, J. and Jiang, X. and Jin, J. and Johnson, B. M. and Joo, K. S. and Jouan, D. and Jumper, D. S. and Kajihara, F. and Kametani, S. and Kamihara, N. and Kamin, J. and Kaneti, S. and Kang, B. H. and Kang, J. H. and Kang, J. S. and Kapustinsky, J. and Karatsu, K. and Kasai, M. and Kawall, D. and Kawashima, M. and Kazantsev, A. V. and Kempel, T. and Khanzadeev, A. and Kijima, K. M. and Kim, B. I. and Kim, C. and Kim, D. H. and Kim, D. J. and Kim, E. and Kim, E. -J. and Kim, H. J. and Kim, K. -B. and Kim, S. H. and Kim, Y. -J. and Kim, Y. K. and Kinney, E. and Kiriluk, K. and Kiss, A. and Kistenev, E. and Klatsky, J. and Kleinjan, D. and Kline, P. and Kochenda, L. and Komatsu, Y. and Komkov, B. and Konno, M. and Koster, J. and Kotchetkov, D. and Kotov, D. and Kozlov, A. and Kral, A. and Kravitz, A. and Krizek, F. and Kunde, G. J. and Kurita, K. and Kurosawa, M. and Kwon, Y. and Kyle, G. S. and Lacey, R. and Lai, Y. S. and Lajoie, J. 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P. and Motschwiller, S. and Moukhanova, T. V. and Murakami, T. and Murata, J. and Nagae, T. and Nagamiya, S. and Nagle, J. L. and Naglis, M. and Nagy, M. I. and Nakagawa, I. and Nakamiya, Y. and Nakamura, K. R. and Nakamura, T. and Nakano, K. and Nattrass, C. and Nederlof, A. and Newby, J. and Nguyen, M. and Nihashi, M. and Nouicer, R. and Novitzky, N. and Nyanin, A. S. and O'Brien, E. and Oda, S. X. and Ogilvie, C. A. and Oka, M. and Okada, K. and Onuki, Y. and Oskarsson, Anders and Ouchida, M. and Ozawa, K. and Pak, R. and Pantuev, V. and Papavassiliou, V. and Park, B. H. and Park, I. H. and Park, J. and Park, S. K. and Park, W. J. and Pate, S. F. and Patel, L. and Pei, H. and Peng, J. -C. and Pereira, H. and Peresedov, V. and Peressounko, D. Yu. and Petti, R. and Pinkenburg, C. and Pisani, R. P. and Proissl, M. and Purschke, M. L. and Purwar, A. K. and Qu, H. and Rak, J. and Rakotozafindrabe, A. and Ravinovich, I. and Read, K. F. and Reygers, K. and Reynolds, D. and Riabov, V. and Riabov, Y. and Richardson, E. and Riveli, N. and Roach, D. and Roche, G. and Rolnick, S. D. and Rosati, M. and Rosen, C. A. and Rosendahl, Sarah and Rosnet, P. and Rukoyatkin, P. and Ruzicka, P. and Sahlmueller, B. and Saito, N. and Sakaguchi, T. and Sakashita, K. and Samsonov, V. and Sano, M. and Sano, S. and Sarsour, M. and Sato, T. and Sawada, S. and Sedgwick, K. and Seele, J. and Seidl, R. and Semenov, A. Yu. and Sen, A. and Seto, R. and Sharma, D. and Shein, I. and Shibata, T. -A. and Shigaki, K. and Shimomura, M. and Shoji, K. and Shukla, P. and Sickles, A. and Silva, C. L. and Silvermyr, D. and Silvestre, C. and Sim, K. S. and Singh, B. K. and Singh, C. P. and Singh, V. and Slunecka, M. and Soltz, R. A. and Sondheim, W. E. and Sorensen, S. P. and Soumya, M. and Sourikova, I. V. and Sparks, N. A. and Stankus, P. W. and Stenlund, Evert and Stepanov, M. and Ster, A. and Stoll, S. P. and Sugitate, T. and Sukhanov, A. and Sun, J. and Sziklai, J. and Takagui, E. M. and Takahara, A. and Taketani, A. and Tanabe, R. and Tanaka, Y. and Taneja, S. and Tanida, K. and Tannenbaum, M. J. and Tarafdar, S. and Taranenko, A. and Tarjan, P. and Tennant, E. and Themann, H. and Thomas, T. L. and Todoroki, T. and Togawa, M. and Toia, A. and Tomasek, L. and Tomasek, M. and Torii, H. and Towell, R. S. and Tserruya, I. and Tsuchimoto, Y. and Tsuji, T. and Vale, C. and Valle, H. and van Hecke, H. W. and Vargyas, M. and Vazquez-Zambrano, E. and Veicht, A. and Velkovska, J. and Vertesi, R. and Vinogradov, A. A. and Virius, M. and Vossen, A. and Vrba, V. and Vznuzdaev, E. and Wang, X. R. and Watanabe, D. and Watanabe, K. and Watanabe, Y. and Watanabe, Y. S. and Wei, F. and Wei, R. and Wessels, J. and Whitaker, S. and White, S. N. and Winter, D. and Wolin, S. and Wood, J. P. and Woody, C. L. and Wright, R. M. and Wysocki, M. and Xie, W. and Yamaguchi, Y. L. and Yamaura, K. and Yang, R. and Yanovich, A. and Ying, J. and Yokkaichi, S. and You, Z. and Young, G. R. and Younus, I. and Yushmanov, I. E. and Zajc, W. A. and Zelenski, A. and Zhang, C. and Zhou, S. and Zolin, L.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Centrality dependence of low-momentum direct-photon production in Au plus Au collisions at root s(NN)=200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.91.064904},
  volume       = {91},
  year         = {2015},
}